Power-press.



v r Pate nted. Aug. 20., l90l.

J. a. HODGSDN.

POWER PRESS.

Application filed Oct. 22, 1900.)

2 Sheets-Sheet I.

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f ATTORNEYS WITNESSES s Ffi 1730x4412 L THE Nukms PETERS 00V mom-Limo wunmumn, m 1:

. j ter one completerevolution ofits driving- UNITED STATES "PATENT FFIQE.

JOHN G. I-IODGSON, OF MAYWOOD, ILLINOIS, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO AMERICAN CAN COMPANY, OF JERSEY CITY, NEWV JERSEY.

POWER-PRESS.

SPEGIFIGATIONforming part of Letters Patent No. 681 ,023, dated August 20, 1901. Application filed October 22, 1900. Serial No. 33.969- (No model.)

. This invention relates to improvements in power-presses.

It consists in the combination, with a driving-shaft of a power-press and a clutch by which the driving-pulley is connected with and disconnected from the shaft, of an automatic safety trip mechanism which automatically disconnects the power from the press afshaft and prevents such disconnection before such complete revolution, although the clutch-treadle itself may in the meanwhile be operated or moved through accident or carelessness of the operator.

It further consists in the. novel construction of parts and devices and in the novel combinations of parts and devices herein shown and described, and specified in the claims.

In the accompanying drawings, forming a part of this specification, Figurel is a side elevation of a power-press embodying or provided with my invent-ion.

Fig. 2 is a detail front elevation, partly in vertical section. Fig. 3 is a perspective view of the segmentcam for automatically withdrawing the clutchpin after one revolution. Fig.4 is a perspec tive view of the clutch-pin. Fig. 5 is a perspective view of the spring-lock bywhich the clutch-pin is withdrawn, and Fig. 6 is a perspective view of the safety-trip.

In said drawings, A represents a powerpress having the customary frame a, bed-. plates a, lower die a movable die or plunger a driving-shaft A, and power-pulley A loose on the shaft. B is the clutch-pin, mounted in the powerpulley A and normally pushed outward by a spring I), which causes the same to engage the recess 1) in the clutch-collar B, which is secured fast to the driving-shaft A of the press.

' C is a movable lock mounted on the powering movement thereon in a radial direction and which operates to hold the clutch-pin B in its retracted position by engagement of its upper end with the clutch-pin or with a projection b thereon, the said projection having, preferably, a notch b in which notch the upper end of the lock 0 may fitwhen the clutch-pinis withdrawn, while the projection 79 may ride on the upper end of the look when the clutch-pin is pushed out by its spring b into engagement with the clutch-collar B. The lock 0 has a spring 0 to force it toward the clutch-pin as required. D is a segmental cam or block having an inclined or cam face d, which operates to automatically push back or. withdraw the clutch-pin B when the power-pulley A completes a single revolution. When the clutch-pin is thus withdrawn, its projection b slips off the upper end of the lock 0, and thus permits the lock (3 to slip into the position to hold the clutch-pin retracted, as illustrated in Fig. 2. .The segment-cam D has a face or edge d, which fits or projects over a lip or projection O on the lock 0, so that by moving the segment-cam downward the lock 0 may be retracted, and thus permit the clutch-pin B to again move outward or into engagement with the clutchcollar. For this purpose the segment-cam is preferably given a vertically-sliding move ment and is furnished with a stem or operating-rod D, reciprocating in suitable guides D on the frame, the same being normally pushed or held upward by a spring D which bears against a collar D secured to the stem D. The stem D is also furnished with a collar, hook, or projection 01 at its.1ower end, adapted to be engaged by the safety-trip F, which is interposedin the connection G G between the clutch-treadle G and the segment-cam D or its operating-rod or stem D. The connecting part G from the treadle is preferably a swinging arm or lever, and the safety-trip F is pivoted to (it by a pin g, and the lever G is furnished with an arm 9, between which and i the safety-trip a spring 9 is interposed to push thesafety-trip out into position for engagement with the collar, hook, or projection d on the stem D. The safetytrip F is furnished with a rounded projection or pin f, which is engaged bya lever H, hav ing an antifriction-roller h at its upper end,

which is automatically engaged and operated by a cam H on the driving-shaft A of the permit the same to move freely past the safety- 1 trip F when the safety-trip is moved back into 1 its uppermost position by the treadle-spring G The cam H holds the safety-trip F retracted out of position for engagement with j the collar or projection on the segment-camoperating rod D, except for a short part of a-time-, no matter whether the operator works the revolution of the shaft A.

The operation is as follows: When the clutch-treadle is depressed, the parts being in the position'illustrated in Figs. 1 and 2, the safety-trip is thus in position to cause the clutch-treadle to operate the segment-cam, and thereby retract the lock '0. Said lock is retracted and the spring of the clutch-pin B pushes the clutch-pin outward into engagement with the clutch-collar B, thus causing the driving-shaft A of the press to revolve until the power-p ulley A makes one complete revolution.

clutch-pin until the revolution is completed,

because very shortly after the revolution begins the cam H through the lever H, pivoted at h, retracts the safety-trip out of position for operation upon the segment-cam and holds the safety-trip in this retracted position unclutch-treadle at the proper time-that is to 3 say, when the revolution is completed. The safety-trip by reason of the cam H prevents any movement of the clutch-treadle from having any effect excepting when the revolution is'complete and the upper die or plunger of the press is open or withdrawn. When the power-press is stopped for examination or repairs, by simply hooking or tying back the safety-trip F all danger or possibility of the press being accidentally set in operation or connected with the power-pulley is absolutely avoided. The safety-trip F has a hook f for this purpose.

It will be understood by those skilled in the art that the sheet metal or other material being operated upon by power-presses is ordinarily placed between the dies by the hand of the operator, and this safety-trip mechanism,

which causes the driving-shaft of the pressto" always make just one complete revolution and prevents the press-shaft from being disconne'cted'from the power-pulley before the downward and upward strokes of the upper die or plunger are completed and prevents the clutch v No further movement of the; clutch-treadle can have any effect upon the 1 from being operated by the clutch-treadle ekcept at the'right time,while causing the pressshaft to be automatically unclutched from the power pulley when the revolution is completed, is of very great convenience and importance in the practical operation of powerpresses or other similar machines and adds materially to the safety of the persons operating the same, as well as preventing breakage, stoppage, or clogging of the mechanism. By this improvement the press is prevented from making more than one stroke or revolution at the foot-treadle slow or fast or even keeps the treadle depressed,and the operator is entirely freed from the necessity of watching the press and keeping time therewith in working the treadle, as has heretofore been the case with presses heretofore in use. In other words, by this improvement the press is always automatically stopped at the right point or time and cannot be again started except at the be-' ginning of a new stroke. It absolutely prevents two revolutions of the crank-shaft of the press with one motion of the foot-treadle,- which heretofore has been the chief danger to operators of power-presses.

1. In a power-press, the combination with the driving=shaftand power-pulleypf aclutch pin, a movable lock for holding the clutch-pin retracted, a movable 'c'am segment or block to automatically Withdraw the clutch-pin, a clutch treadle or lever,- a connection between the same and said movable cam segmentor block, a safety-trip in said connection, and a cam and level for automatically retracting said safety-trip, substantially asspecifi-ed.

2. The combination with a clutch-collar and spring clutch-pin, of a lock for holding the clutch-pin withdrawn,- a movable c'am seg' ment or block to automatically withdr'aw'the cl utch-pimmechani-sm for retracting said lock provided with an automatically operated safety-trip, substantially as specified.-

3. The combination with the clutch having a clutch-pin and its operating mechanism, including a movable lock for holding the clutch-' pin retracted-,a movable dam segment'or block to automatically withdraw the clutch-pin, of an automatic safety-trip, substantially as specified.

4. The combination with clutch having a clutch-pin, of a movable lock for holding the clutch disengaged, a movable cam segment or block to automatically withdraw the clutchpin, mechanism for operating said lock provided with a safety-trip, and automatic mechanism for operating and holding said safetytrip retracted, substantially as specified.

Thecomb-ination with a clutch-collar and spring clutch-pin B, having projection 79 of movable lock 0-, having projection (Ream segment or block D having operating stem or red D", safety-trip F, lever H and cam H, substantially as specified.

6. The combination with a clutch-collar and Its spring clutch-pin Bihaving projection 11 of movable lock O,having projection O ,'cam segment or block D having operating stem or rod D, safety-trip F, lever H, cam H, connectinglever G, link G, and treadle or lever G substantially as specified. i

7. The combination with a clutch-collar and spring clutch-pin B, having projection o of movable lock G,having projection Oicam segment or block D having operating stem or rod. 10

D, safety-trip F, lever H,cam I-I',connectinglever G,1ink G, said connecting-lever G hav ing arm g and spring gisubstantially as specified.

JOHN G. I-IODGSON. Witnesses:

EDMUND ADoooK,

H. M. MUNDAY. 

